Bed-bottom structure



G. S. GREENLEAF.

BED BOTTOM STRUCTURE. APPLICATION man JUNE 14. 1919.

Patented May 18, 1920.

W Benn e S- Breanleaf I GEORGE S. GREENLEAF, OF CHICAGO, ILLINOIS.

-IBEDBOTTOM STRUCTURE.

Application filed June 14, 1919.

To all whom it may concern.-

Be it known that I, GEORGE S. GREENLEAF, a citizen of the United States, and resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Bed-Bottom Structures; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to new and useful improvements in bed bottom structures and is more particularly directed to the provision of means for procuring a resilient yielding of the mattress supporting structures thereof.

It is in general the object of my invention to simplify and otherwise improve the structure and to increase the durability of devices of this character.

More particularly, it is an important object of my invention to avoid the necessity of providing the heretofore usual multiplicity of small contractile springs, and to embody the spring means of the bed bottom in a minimum number of relatively strong expansion coil springs which will maintain effective resilient action for a maximum length of time and which will avoid the yielding or sagging tendenc incidental to the use of a multiplicity 0 small tension springs.

A further object resides in the provision of an improved fabric for the bed bottom which will not yield upon continued use.

A still further object resides in the provision in a bed bottom structure of means for discouraging vermin.

With the above and other objects and advantages in view, which will be apparent as the description proceeds, my invention resides in the novel features of construction, combination and arrangement of parts which will be hereinafter more particularly described and defined by the appended claims.

In the accompanying drawings:

Figure 1 is a plan view of a bed bottom constructed in accordance with my invention.

Fig. 2 is a side elevational view of the bed bottom.

"Fig. 3 is an end elevational view of the bed bottom.

Fig. 4 is a detail sectional view through one of the spring units of the bed bottom on a plane indicated by the line &- 1 of Fig. 1.

Specification of Letters Patent.

- Patented May 18, 1920.

Serial No. 304,159.

Referring now more particularly to the drawings, my improved bed bottom comprises a main frame formed of the. side sills 5 and superposed end sills 6,spacer blocks 7 being disposed between the contiguous portions of the side and end sills. Each corner portion of the frame carries a spring unit which comprises in the present instance a bracket plate 8 secured on the corresponding end sill by fastening members 9 passed therethrough and through the sills, and which at the same time effect the junctures of the sills. A pair of arms 10 extend upwardly from the bracket plate and carrying a pivot shaft 11 which is passed through ears on the intermediate side portions of a lever plate 12. A bolt 13 is passed through the lower portion of the lever plate and extends inwardly of the frame through a spring seating web 14; which extends between and is carried by the bracket arms 10. A strong compression spring 15 is coiled on this bolt and bears against the web 14: and against a holding cap 16 secured on the inner end of the bolt, the tension of the spring being adjustable by means of a retaining nut 17 which is threaded on the bolt to hold the cap 16. An end angle rail 18 is secured to the spring lever plates 12 at each end of the bed frame, and these end plates carry the bed bottom fabric.

I preferably form the bed bottom fabric of longitudinal and transverse series of steel ribbons 19 and 20, the ribbons being secured together at their crossing points by rivets 21 or other suitable securing means, and the ends of the longitudinal series of ribbons are fixedly secured to the end rails 18.

An exceedingly simple and comfortable bed bottom structure is thus provided, which will prove durable under extended and severe conditions of use. The steel ribbon fabric affords an absolutely non-stretchable supporting surface, which however, possesses a suflicient degree of resilience to effect the necessary yielding. By providing a minimum number of relatively strong compression springs, operative in the manner described, the load stresses on the bed structure are at all times evenly distributed among the springs and stretching action to permit sagging of the bed bottom fabric upon continuous use is avoided.

I preferably form the side and end frame rails 5 and 6 of suitable wood to meet the load stresses imposed on the bed, and to preand vent the lodgment of bedbugs on the frame, I preferably provide the rails with a sheathing or veneer sheet 22 of material which repulses such vermin, and I find red cedar particularly valuable for this purpose.

lVhile I have shown and described a preferred embodiment of my invention, it will be appreciated that various changes and modifications of structure may be employed to meet differing conditions of use, Without departing in any manner from the spirit of my invention.

.lVhat' is claimed is l. A bed bottom structure including a main frame, a plate secured on each corner of the frame, a pair of bracket arms integral with and extending upwardly from each of said plates, a spring seating web integral with and extending between each pair of bracket arms, a lever plate intermediately pivoted to the upper ends of each pair of bracket arms, a bolt passed through each lever plate and extending inwardly past the web, a spring seating member disposed on the inner portion of the belt, a compression spring on the bolt bearing against said web and said spring seating member, an end rail secured to the upper ends of the lever plates at each end of the main frame, and a bedbottom fabric extending between and secured to said rails.

2. A bed bottom structure including a main frame, bracket plates secured on the ends of the frame, a pair of bracket arms extending upwardly from each bracket plate, a web extending between and bracingsaid pair of bracket arms, a lever intermediately pivoted to the upper ends of the bracket arms, a bolt extending from the leverplate and slidably passed through said web, a spring on the bolt seating against the web, an end rail secured to the-upperends of the levers at each end of the main frame, and a bed bottom fabric extending between and secured to said rails.

In testimony that I claim the foregoing I have hereunto set my hand at Chicago, in the county of Cook and State of Illinois.

GEO. s. GREENLEAF. 

